HIgher garrison count or build ships faster

I just won the scenario "Superpowers" and my garrisons carried me early to mid-game.  Since the game starts you with T4 research already completed, I rushed military T5 first to get the 500 size garrisons.  I am thinking of playing again and doing the T5 civilian first to get "Industrial Juggernaut" which reduces ship build time by 50%.  My thinking is that a smaller garrison that can replenish faster might be better than a higher garrison count.

What are your thoughts?